package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.item.dto.SpecGroupDTO;
import com.leyou.item.dto.SpecParamDTO;
import com.leyou.item.entity.SpecGroup;
import com.leyou.item.entity.SpecParam;
import com.leyou.item.mapper.SpecGroupMapper;
import com.leyou.item.service.SpecGroupService;
import com.leyou.item.service.SpecParamService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class SpecGroupServiceImpl extends ServiceImpl<SpecGroupMapper, SpecGroup> implements SpecGroupService {

    @Autowired
    private SpecParamService paramService;
    @Override
    public List<SpecGroupDTO> queryGroupByCategory(Long cid) {

        List<SpecGroupDTO> specGroupDTOS =
                SpecGroupDTO.convertEntityList(query().eq("category_id", cid).list());


        List<SpecParam> specParams =
                this.paramService.query().eq("category_id", cid).list();

        //map 的key就是groupId，value为，同groupId下的所有的规格参数信息
        Map<Long, List<SpecParam>> collect =
                specParams
                        .stream()
                        .collect(
                                Collectors.groupingBy(SpecParam::getGroupId));

        specGroupDTOS.forEach(specGroupDTO -> {
            specGroupDTO.setParams(SpecParamDTO.convertEntityList(collect.get(specGroupDTO.getId())));
        });

        return specGroupDTOS;
    }
}
